title: Photoinduced pH drops in water.
abstract: A 2-hydroxyazobenzene platform has been evaluated to photorelease protons in aqueous solutions. Three different systems relying on molecular, supramolecular and polymeric strategies have been investigated in order to tune the water solubility and the thermodynamic and kinetic properties. This paper first reports on the syntheses and the physico chemical analyses for each system. Subsequently, we show that the three strategies are appropriate to reversibly photo-generate tunable pH drops in water up to one pH unit amplitude and at the 10-100 s timescale, upon transient illumination at 365 nm.
authors.affiliation: Ecole Normale Supérieure, Département de Chimie, UMR CNRS-ENS-UPMC Paris 06 8640 Pasteur, 24, rue Lhomond, 75231 Paris Cedex 05, France.
authors.forename: Matthieu
authors.initials: M
authors.lastname: Emond
authors.forename: Jing
authors.initials: J
authors.lastname: Sun
authors.forename: Jean
authors.initials: J
authors.lastname: Grégoire
authors.forename: Sylvie
authors.initials: S
authors.lastname: Maurin
authors.forename: Christophe
authors.initials: C
authors.lastname: Tribet
authors.forename: Ludovic
authors.initials: L
authors.lastname: Jullien